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# Questions tagged [mental-poker]

Mental poker is the common description for a set of cryptographic problems related to playing a fair game over a distance without the need for any trusted third party.

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158 views

### Would this mental poker algorithm work?

I had an idea for a Mental Poker algorithm. Since I'm a n00b, there is likely to be things wrong with it. But since I'm a n00b, I am not able to detect the problems yet. Would this algorithm ensure ...
54 views

### Is it safe to publicly announce the prime number in Shamir three-pass protocol

So say, I want to use a prime number p for anyone that wants to communicate with me using Shamir's Three Pass Protocol. I will be maintaining my secret keypair (encryption exponent, decryption ...
296 views

### Is there a mental poker algorithm that does not rely on commutative encryption?

The algorithm for mental poker that I saw on Wikipedia and everywhere else relies on an encryption algorithm such that $E_k(E_j(P)) = E_j(E_k(P))$, but I can't find a modern and secure algorithm for ...
143 views

### Understanding ElGamal encryption for a Mental Poker Case

I am looking to understand ElGamal encryption as it is used in a specic context described below. I am interested in creating a practical form of Mental Poker for games other than poker developed by ...
173 views

### Is there a cryptographic way (a la mental poker) two people can determine if they both Like each other, without revealing their personal preferences?

Specifically: Alice and Bob want to know if they like each other, but won't admit it if the other person doesn't reciprocate. (They're teenagers, or physicists.) They don't trust anyone else, so want ...
171 views

### Isn't Socialist Millionaires vulnerable if Alice's and Bob's message are picked from a shared list?

I'm interested in a situation where Alice and Bob each pick cards from a deck of 52, and want to test if they picked the same card without revealing what the card is (a "mental poker" situation). The ...
530 views

### Cryptographic system with double keys with reversible order

While reading Shamir, Rivest and Adleman's paper on "Mental Poker", I've met a mention of system such that $E_a(E_b(x)) = E_b(E_a(x))$, without however disclosing details on it, with $E_a(x)$ being “...
162 views

### A question or few about Mental Poker

I have spent some time studying the "Mental Poker" protocol (sometimes called SRA), initially proposed by Shamir, Rivest, and Adleman -- http://people.csail.mit.edu/~rivest/ShamirRivestAdleman-...
682 views

### Is there a public key semantically secure cryptosystem for which one can prove in zero knowledge the equivalence of two plaintexts?

If Alice encrypts two messages $a$ and $b$, such that $x=E(a)$, $y=E(b)$. Can Alice prove (without revealing $a$, $b$ or the private key) that $a = b$? Obviously the proof must not be too long and it ...
204 views

### Relaxed trust criterion for mental poker server?

I've read a lot about protocols for mental poker without a trusted server, but I'm interested in the possibility of a faster, more practical protocol that relaxes that criterion a bit and "trusts" a ...